मराठी

Name the Material Which is Used for Making the Filaments of an Electric Bulb.

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प्रश्न

Name the material which is used for making the filaments of an electric bulb.

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उत्तर

Tungsten is used for making the filament of an electric bulb.

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पाठ 4: Electricity - Exercise 8 [पृष्ठ २५९]

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लखमीर सिंह Physics Part 1 [English] Class 10
पाठ 4 Electricity
Exercise 8 | Q 21. (e) | पृष्ठ २५९

व्हिडिओ ट्यूटोरियलVIEW ALL [1]

संबंधित प्रश्‍न

An electric heater of resistance 8 Ω draws 15 A from the service mains 2 hours. Calculate the rate at which heat is developed in the heater.


An electric heater is connected to the 230 V mains supply. A current of 8 A flows through the heater.

  1. How much charge flows around the circuit each second?
  2. How much energy is transferred to the heater each second?

An electric heater is connected to the 230 V mains supply. A current of 8 A flows through the heater. 

(b) How much energy is transferred to the heater each second?


An electric kettle rated at 220 V, 2.2 kW, works for 3 hours. Find the energy consumed and the current drawn.


A heating coil has a resistance of 200 Ω. At what rate will heat be produced in it when a current of 2.5 A flows through it?


Derive the expression for the heat produced due to a current 'I' flowing for a time interval 't' through a resistor 'R' having a potential difference 'V' across its ends. With which name is this relation known?


If the current flowing through a fixed resistor is halved, the heat produced in it will become:


Rewrite the following statement by selecting the correct option:

1 A = ____________ mA.


Explain the heating effect of electric current.


An electric component used as a safety device is electric circuit is ______.


Your teacher has shown you the following activity.


Activity: Teacher has wound a long insulated piece of wire around an iron nail in the form of a coil. Free ends of the wire are connected to a cell through a switch as shown in the following figure. The current is switched on and some pins are placed near the ends of the nail.

Write down any three questions that come to your mind about this activity.


What are the uses of electromagnets?


Name the effect of the current responsible for the glow of the bulb in an electrical circuit.


If 220 V potential difference is applied across an electric bulb, a current of 0.45 A flows in the bulb. What must be the power of the bulb?


Tara, after completing her exams, went to her grandmother's house along with her younger brother Rahul. One day, Rahul came home after playing and switched on the fan and air conditioner. At the same time, his grandmother was preparing a milkshake for him using a mixer. Suddenly, they heard a big sound and the electricity of the house got shut down. Tara is called an electrician. He said the main reason for supply to shut down was overloading.

  1. What is overloading?
  2. Is overloading and short the same? When does short-circuiting take place?
  3. How can the effects of overloading be avoided?

1 kWh is equal to ______.


In which of the following applications of Iron, rusting will occur most? Support your answer with valid reason.

A B C D

An electric kettle of 2 kW is used for 2h. Calculate the energy consumed in 

  1. kilowatt hour and
  2. joules.

Anannya responded to the question: Why do electrical appliances with metallic bodies are connected to the mains through a three-pin plug, whereas an electric bulb can be connected with a two-pin plug?

She wrote: Three-pin connections reduce heating of connecting wires.

  1. Is her answer correct or incorrect? Justify.
  2. What is the function of a fuse in a domestic circuit?

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